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Yankee Notch class, 6 Yankee's where planned for conversion to SSGN submarines but only 4 completed from 1982 till early 1991. They incorporated a "notch waisted" center section, which replaced the old ballistic missile compartment, featuring eight 533 mm torpedo tubes for up to 40 SS-N-21 missiles or additional torpedoes.The forward torpedo tubes were retained as well, there where all withdrawn from active service in early '00's:

Akula

TERRITORY, RUSSIA. MARCH 19, 2016. The K-419 Kuzbass, a Project 971 Akula-class nuclear-powered attack submarine, joins the Russian Pacific Fleet after undergoing repairs at the Zvezda shipyard. The submarine's life-support systems and radio and hydroacoustic equipment have been upgraded. Yuri Smityuk/TASS